मुफ़्त पेंट कैलकुलेटर
जानें कि कमरे के लिए कितना पेंट चाहिए — गैलन और डिब्बों में, दरवाज़े और खिड़कियाँ घटाकर। मुफ़्त, तेज़ और पूरी तरह आपके ब्राउज़र में, बिना साइन-अप के।
अपडेट किया गया
Paint coverage
Add up the length of every wall.
Paint needed
1.54
US gallons
- Paintable wall area
- 269ft²
- 1-gallon cans
- 2cans
How this is calculated
paintable = (perimeter × height) − openings; gallons = paintable × coats ÷ 350
- One US gallon covers about 350 ft² per coat on primed, smooth wall.
- A standard door is treated as 21 ft² and a window as 15 ft².
- Heavily textured or unprimed surfaces can drop coverage to 250 ft²/gallon.
- Ceilings and trim are not included.
अक्सर पूछे जाने वाले प्रश्न
How does the Paint Calculator work?
It applies the formula paintable = (perimeter × height) − openings; gallons = paintable × coats ÷ 350. Enter your measurements and the result updates instantly in your browser — nothing is uploaded and no sign-up is needed.
Why should I include a waste allowance?
Offcuts, spillage, breakage and an uneven sub-base all consume material that the raw geometry does not account for. The default allowance is deliberately modest; increase it for complex layouts, and remember that running short usually costs more in a second delivery than the surplus did.
Are the results exact?
They are a close estimate, not a guarantee. One US gallon covers about 350 ft² per coat on primed, smooth wall. Real materials vary by supplier, moisture content and compaction, so confirm the rate with your supplier before placing a large order.
Is this tool free?
Yes, completely free with no registration. All calculations happen client-side in your browser.
Does it work on mobile?
Yes. The calculator is fully responsive and works on phones and tablets in any modern browser — useful when you are measuring on site.
संबंधित टूल
मुफ़्त ड्राईवॉल कैलकुलेटर
कमरे की परिधि और दीवार की ऊँचाई से ड्राईवॉल शीट, स्क्रू और जॉइंट कंपाउंड का अनुमान लगाएँ। मुफ़्त, तेज़ और पूरी तरह आपके ब्राउज़र में, बिना साइन-अप के।
मुफ़्त टाइल कैलकुलेटर
जानें कि फ़र्श या दीवार के लिए कितनी टाइलें चाहिए — बर्बादी की छूट और बॉक्स संख्या सहित। मुफ़्त, तेज़ और पूरी तरह आपके ब्राउज़र में, बिना साइन-अप के।
मुफ़्त ऑनलाइन आयु कैलकुलेटर
राशि चिह्नों के साथ अपनी सटीक आयु वर्षों, महीनों और दिनों में गणना करें। मुफ़्त, तेज़ और पूरी तरह आपके ब्राउज़र में काम करता है, बिना साइन-अप के।
मुफ़्त प्रतिशत कैलकुलेटर
कई गणना विधियों के साथ आसानी से प्रतिशत की गणना करें। मुफ़्त, तेज़ और पूरी तरह आपके ब्राउज़र में काम करता है, बिना साइन-अप के।
About the Paint Calculator
The Paint Calculator works out the paintable wall area of a room from its perimeter and height, deducts standard door and window openings, then converts that into gallons for the number of coats you plan. Enter your measurements and the result updates as you type — there is nothing to submit and nothing to wait for.
Everything runs in your browser. Nothing you enter is sent to a server, there is no sign-up, and there is no usage limit.
Who it's for
Anyone repainting a room and wanting to buy the right amount first time.
How the calculation works
paintable = (perimeter × height) − openings; gallons = paintable × coats ÷ 350
The result depends on a few standard constants, which are stated on the page rather than hidden:
- One US gallon covers about 350 ft² per coat on primed, smooth wall.
- A standard door is treated as 21 ft² and a window as 15 ft².
- Heavily textured or unprimed surfaces can drop coverage to 250 ft²/gallon.
- Ceilings and trim are not included.
Getting an accurate estimate
Measure twice. Small errors in a linear dimension compound, because material volume scales with two or three of them at once — a 6-inch error across a 20-foot run is over a cubic foot of material on a 4-inch pour.
Keep the waste allowance. The default is deliberately conservative: offcuts, spillage, uneven sub-base and breakage are all real, and running short mid-job usually costs more in a second delivery than the surplus did.
Round up when you order. Suppliers sell in fixed increments — quarter yards, whole bags, full boxes — so treat the figure here as the minimum you need rather than the exact amount to buy.